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server.go
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server.go
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// server.go: implements http handler interface so that Generator struct can be used directly as a handler
package catalog
import (
"encoding/base64"
"fmt"
"html"
"net/http"
"net/url"
"path"
"strings"
"github.com/anz-bank/sysl/pkg/sysl"
"github.com/anz-bank/sysl/pkg/syslwrapper"
"github.com/spf13/afero"
)
// Update loads another Sysl module into a project and runs
func (p *Generator) Update(m *sysl.Module, errs ...error) *Generator {
//p.Fs = afero.NewMemMapFs()
p.errs = []error{}
for _, err := range errs {
if err != nil {
p.errs = append(p.errs, err)
// Clear generated files since we only want to display an error
p.GeneratedFiles = nil
p.Fs = afero.NewMemMapFs()
}
}
if len(p.errs) == 0 {
p.RootModule = m
p.GeneratedFiles = make(map[string][]byte)
p.Mapper = syslwrapper.MakeAppMapper(m)
p.Mapper.IndexTypes()
p.Mapper.ConvertTypes()
if p.RootModule != nil && len(p.ModuleAsMacroPackage(p.RootModule)) <= 1 && !p.CustomTemplate {
p.StartTemplateIndex = 1 // skip the MacroPackageProject
} else {
p.StartTemplateIndex = 0
}
p.Run()
}
return p
}
// ServerSettings sets the server settings, this should be set before using as http handler
func (p *Generator) ServerSettings(disableCSS, liveReload, imageTags bool) *Generator {
p.DisableCss = disableCSS
p.LiveReload = liveReload
p.OutputDir = "/"
p.Server = true
p.Fs = afero.NewMemMapFs()
return p
}
// ServeHTTP is implements the handler interface
func (p *Generator) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var (
bytes []byte
file string
err error
)
defer func() {
if _, err := w.Write(bytes); err != nil {
p.Log.Info(err)
}
}()
defer func() {
if len(p.errs) > 0 {
bytes = convertToEscapedHTML(fmt.Sprintln(p.errs))
}
}()
request := r.URL.Path
if p.RootModule == nil && path.Ext(request) != ".ico" {
bytes = convertToHTML(`<img class="blink-image" src="favicon.ico">` + flashing)
return
}
if p.Fs == nil && path.Ext(request) != ".ico" {
p.Update(p.RootModule)
}
switch path.Ext(request) {
case ".svg":
w.Header().Set("Content-Type", "image/svg+xml")
unescapedPath, err := url.PathUnescape(request)
if err != nil {
p.errs = append(p.errs, err)
}
if svg, ok := p.GeneratedFiles[path.Join(unescapedPath)]; ok {
bytes = svg
return
}
p.errs = []error{}
if err != nil {
p.errs = append(p.errs, err)
}
p.GeneratedFiles[path.Join(unescapedPath)] = bytes
return
case ".ico":
bytes, err = base64.StdEncoding.DecodeString(favicon)
if err != nil {
p.errs = append(p.errs, err)
p.Log.Info(err)
}
return
case ".yaml", ".yml", ".json", ".sysl":
bytes, err = afero.ReadFile(afero.NewOsFs(), strings.TrimPrefix(request, "/"))
if err != nil {
p.Log.Error(err)
return
}
return
case "":
request += "index.html"
}
bytes, err = afero.ReadFile(p.Fs, path.Join(p.OutputDir, request))
if err != nil {
if len(p.errs) > 0 && p.errs[len(p.errs)-1].Error() == err.Error() {
return
}
p.errs = append(p.errs, err)
p.Log.Info(err)
return
}
file = string(bytes)
if !p.LiveReload {
p.errs = []error{}
return
}
switch p.Format {
case "html":
bytes = []byte(file + liveReload)
if p.DisableCss {
bytes = convertToEscapedHTML(file)
}
default:
bytes = convertToEscapedHTML(file)
}
p.errs = []error{}
}
func convertToEscapedHTML(file string) []byte {
return []byte(
header +
`<pre style="word-wrap: break-word; white-space: pre-wrap;">` +
html.EscapeString(file) +
`</pre>` + liveReload + endTags)
}
func convertToHTML(file string) []byte {
return []byte(header + file + liveReload + endTags)
}